Nowruz is the name of the Iranian New Year, also known as the Persian New Year, which is celebrated worldwide, along with some other ethno-linguistic groups, as the beginning of the New Year. It has been celebrated for over 3,000 years in Western Asia, Central Asia, the Caucasus, the Black Sea Basin and the Balkans. It marks the first day of the first month (Farvardin) in calendar. Nowruz is the day of the vernal equinox, and marks the beginning of spring in the Northern Hemisphere. It usually occurs on 21 March or the previous or following day, depending on where it is observed.